Concrete-mixer.



A. W. RANSOME, CONCRETE 1111x1111.

APPLICATION FILED DBO. 30,1908.

$82,020. Patented 111111.17, 1911.

a 1 A B W I I ATTORNEY sra rgn s PATENT ormon.

ARTHUR. w. nANsoMn, or NEW'YORK, N. Y.

CONCRETE-MIXER.

To all whom it may concern.-

""'Be itknown that I, ARTHUR l/V. Ransonni 'df'the borough of-Richmond, city and State] New York, have invented certain new and useful Improvements in Concrete-Mixers, of

" which the following is a. full, clear, and

exact specification, such as will enable others skilled in the art to which itappertains to make and use the same.

My inventionrelates to an improvement in rotary dru m concrete mixers and particulariy in. that forming the subject matter of my prior Patent No. 870,797, dated November 12, 1907.

The objectof the present invention is-to increase the capaclty of the mixer and prevent splashing or spilling the contents thereof out through the open ends of the drum. I attain this end by certain novel features of construction and arrangement of parts which will be fully set forth hereinafter and pz irticularly pointed out in the claims.

Reference is had to the accompanying drawings which illustrate, as-an example, one manner of embodying my invention, in which drawings,

Figure 1 is a view of the interior of the drum with the advancing and return blades, the drawing supposing that a section of the drum hasbeen rolled out fiat better to exhibit the subject matter; and Fig. 2iis a detail of one of the advancing blades.

In the practice of 'my invention I have found that the tendency of the, operations within the drum is to bank the material higher toward the heads or ends of the drum than in the middle; and I have also found that if a sutlicient number of advancing blades be employed to insure, with' their lifting pockets, a rapid discharge of the concrete such. blades tend, when the machine is operated to mix and not to discharge, to throw the concrete from the lifting pocket of one blade into the lifting pocket of the following blade with the result that the same material is again lifted but without being subjected to the action of the effected by a' peculiar construction of the- Specification of Letters Patent. t nt Jan, 17, 19 Application filed December 30, 1908. Serial No. 470,028.

advancing blade rendering it narrower in the middle than at the ends and-by a change in theconstruction of the return" blades which enables them notonly to serve as means for efl'ectingthe return motion of the.

concrete, but also as lifting pockets. In this way I cause the material to bank in the middle of the drum and I insure ayrapid 10 and 10 Of these sectionsthe latter, 10,

has a lifting pocket l0 therein andits inner edge from the lifting pocket toward the middle slants outward toward the wall'of the drum as indicated at 10. The section 10 has its inner edge 1O slanted inward similarly and the two tapered extremities of the sections 10 and 10 are lapped past each other and riveted together as indicated at 10. This not only strengthens the blade and enables the same to be made with less waste material than heretofore, but it gives the blade a decreased width at its middle portion... The result is that as the blade lifts with the rotation ofthe drum, it gathers a larger -quantity of concrete at its ends than at its middle and 'it, therefore, takes thiscomparativelyv large mass of concrete from the end portions of the drum reducing the concrete at'this point. As the motion of the drum continues and the blade advances its elevation, the natural tendency of the concrete loaded thereon is to slip 'toward the lower or narrow middle portion of the blade and the major portion of the concrete instead of being discharged fromthe bladeat its'ends, slips to the middle of the blade and is discharged from the same into the middle portion of the drum. By this improvement,

therefore, I cause the concrete to arch up in the middle of the drum and thus enable the mixer to be loaded to its full capacity without, however, piling the material in theends any higher than the outlet openings, and, therefore, without endangering spilling the material at this point.

The return blades 14 instead of being straight as shown in Fig. 5 of my prior patent, I form at their inner -.'extremit1es bends f'14= illustrated in Fig. 1! of the drawings,

into the lifting pocket of the blade follow -v ing, but will discharge ust beyond such lifting pocket; upon one of the return blades 14:

and in this Way I insure the back and forth motion of the concrete in the drum which results in a thorough admlxture of the various materials; 7 Having thus described my invention, What I claim as new and desire to secure by Letters Patent of the United States is:

1. A rotary drum mixer having a mixing blade with a lifting pocket in one end portion thereof and its middle portion of less width than either end portions for the pur pose specified.

2; 'A rotary drum concrete mixer having advancing and return blades'the former being narrower at-their middle portions thanat their ends and the latter having their inner end portions forming lifting pockets for the purpose specified.

3. A rotary drum concrete mixer having advancing and return blades the former constructed of two sectionstaperingtoward the middle and fastened together at said point and the. latter having their inner ex see, 020

tremities forming lifting pockets forthe purpose specified. v

A rotary drum concretemixer having a mixing blade'narrower at its middle portion and formed of two sections tapering toward the. middle and having'their-ends overlapped and joined together at the middle to reinforce said narrower portion. 5. A rotary drum concrete mixer having advancing and return blades, the return blades extending inwardly from adjacent one-end of the drum, a portion only of} the length of the latter and having theif'inner extremities bent to form lifting pockets- '50 G. A rotary drum concrete mixer having a mixing blade extending substantially from end to end thereof and formed of two s" tions, said sections being overlapped a joined together adjacent the middle of the blade to reinforce the latter; 7. A rotary drum concrete mixer having a mixing blade extending substantially from end to end thereof and having one end'portion thereof'be'nt to form a lifting pocket, said blade being formed of two sectfmns overlappingand secured together adjacent the center of the blade to reinforce the latter.

K In. testimony whereoflliave sighed my name to this specification 1n the presence of two subscribing. Witnesses.-

' ARTHUR W. RANSOM Witnesses: FRANK V.- Lawnmvon, ARTHUR C. SmonN'roP. 

